10x24x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 9.75 x 23.75) - 3 Pack 3" Round Duct Pipe or diffusers

or diffusers

2" X 12" Is The Size For The Duct Opening Measurement Only

and yet lightweight and easy to handle

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10x24x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 9.75 x 23.75) - 3 Pack 3" Round Duct Pipe or diffusers+ Product Details 10" x 24" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 9. 75" x 23. 75") A unique combination of cotton & synthetic fibers gives you the most filtration and the least air resistance equals great air & easy airflow for your system. The non pleated design provides low airflow resistance while still effectively capturing dirt and particles such as standing dust, spray paint